斯特林回热器交变流压差实验研究

发布时间：2018-04-20 07:45

本文选题：斯特林 + 直线电机　；参考：《华中科技大学》2014年硕士论文

【摘要】：自由活塞斯特林发动机具有结构紧凑、效率高、能源利用广、污染小等优点，在解决能源紧缺和环境污染等问题上具有巨大的潜力，引起了广泛的关注和兴趣。回热器和直线电机是自由活塞斯特林发动机中重要部件，其性能及参数之间的匹配程度直接影响着斯特林的效率，因此有必要对其进行研究。本文主要对回热器在交变流下的端部压差进行实验测试以及基于CFD模拟辨识回热器端部速度。具体工作包括：1、对交变流驱动源（横向磁通动磁直线电机）进行电磁分析，运用电磁场模拟软件研究电机推力及侧向力。得出推力随行程变化的关系；显示推力波动主要是由定位力造成的，端部效应的影响较弱。2、基于自行设计的直线电机搭建了交变流回热器实验台。测试在不同工作频率、充气压力、活塞相位角的情况下斯特林回热器的动态压差。实验显示回热器两端压力存在相移且受端部运动相位影响，表明交变流回热器显著区别于单向流，全局参数耦合影响部件性能。3、研究了实现回热器软测量的端部速度辨识方法，该方法通过对测试台进行整机建模（采用UDF以及动网格技术实现交变流边界条件，回热器采用多孔介质模型），以测试数据为仿真条件，通过多孔介质参数调整实现仿真参数与测试数据的匹配，该条件下的测试区速度即为软测量结果。作为回热器参数化研究的补充，，运用REGEN软件对回热器工况进行了寻优。计算结果指示出的端部速度(质量流)-压力相角可为整机模拟提供优化区域。
[Abstract]:Free piston Stirling engine has many advantages such as compact structure, high efficiency, wide energy utilization and low pollution. It has great potential to solve the problems of energy shortage and environmental pollution, and has attracted wide attention and interest. The regenerator and linear motor are important parts in the free piston Stirling engine. The performance and matching degree of the parameters directly affect the efficiency of Stirling, so it is necessary to study them. In this paper, the end pressure difference of the regenerator under alternating current is tested experimentally and the end velocity of the regenerator is identified by CFD simulation. The specific work includes the electromagnetic analysis of the alternating current driving source (transverse flux dynamic magnetic linear motor), and the application of electromagnetic field simulation software to study the thrust and lateral force of the motor. The relationship between thrust and stroke is obtained, which shows that the thrust fluctuation is mainly caused by positioning force, and the effect of end effect is weak. Based on the self-designed linear motor, an alternating current regenerator experimental platform is built. The dynamic pressure difference of Stirling regenerator is measured at different working frequency, inflatable pressure and piston phase angle. The experimental results show that the pressure at both ends of the regenerator is phase shifted and affected by the moving phase of the end, which indicates that the alternating flow regenerator is significantly different from the one-way flow, and the global parameter coupling affects the performance of the unit .3.The method of end velocity identification for soft sensing of the regenerator is studied. In this method, the whole machine is modeled by using UDF and dynamic grid technology to realize the alternating flow boundary condition, and the regenerator adopts the porous medium model, and takes the test data as the simulation condition. By adjusting the parameters of porous media, the simulation parameters can be matched with the test data, and the velocity of the test area under this condition is the result of soft sensing. As a supplement to the parameterization research of the regenerator, the optimal condition of the regenerator is obtained by using REGEN software. The calculated results indicate that the end velocity (mass flow-pressure phase angle) can provide an optimized region for the whole machine simulation.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB65

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